Agreed this is a strange counterintuitive example, but I feel like the comments are using this as a platform to remove the entire system. We will be looking into some ways to prevent this type of specific scenario with SWK, but we are still very happy with the brawling system as a whole.
Brawling is a better solution for healing for 2 specific reasons - in combat vs out of combat rules and applying to all healing
We want to have rules attached to ALL healing for in combat and out of combat. So, even if we were to implement something more specific to each healing god/item and lifesteal - we would be redundantly stating that things have decreased out of combat healing everywhere. Which just feels messier and achieves the same effect.
We also do intend to nerf all healing, this includes lifesteal and smaller self heals, not just group healing. So again brawling is a nice solution for applying game wide, as we would want it to anyway.